Evaluation of cochlear implant receptor-stimulator migration using the bony bed technique without sutures: objective measurements

• Ano de defesa: 2022
• Autor(a) principal: Nunes, Letícia Alves da Fonseca Aguera
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Bony bed; Cochlear implant; Fixation methods; Hearing loss; Implante coclear; Métodos de fixação; Nicho ósseo; Perda de audição; Receptor-estimulador; Receptor-stimulator; Surgical technique; Técnica cirúrgica
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/61/61132/tde-24082022-153008/

Objective: To evaluate the migration of receptor stimulators in patients who underwent cochlear implant surgery using the bony bed technique without sutures. Methods: This prospective observational study included 83 patients who underwent cochlear implant surgery at the Hospital for Rehabilitation of Craniofacial Anomalies at the University of São Paulo. Patients were aged between 12 months and 60 years. Data collected included the distance between the receptorstimulator magnet (RS) and three predetermined anatomical points: the tip of the mastoid apophysis (M), the tragus (T), and the lateral corner of the eye (E). A millimeter (mm) tape measure was used for measurements in the immediate postoperative period and at 1, 3, 6, and 12 months after surgery. Results: The mean measurements of the distances from the device to the M, T, and E in the immediate postoperative period were 98.23 mm ± 10.12 (mean ± SD), 96.48 mm ±10.62, and 142.52 mm ±10.36, respectively. The progression of RS positioning showed that migration occurred up to 3 months postoperatively, highlighting the measurement between RS and M, which presented a statistically significant variation between the first and third measurements. Measurements performed 312 months postoperatively showed no statistically significant variation. Discussion: The objective serial measurements performed in the present study showed the progression of RS migration, which was not statistically significant 3 months after implantation. Conclusion: The results of this study corroborate the literature: the bony bed technique without sutures provides stability to the device, consequently preventing its migration.